Weight and milk production records of
Polled Hereford cows born from 1967 to 1979
were used to fit growth and lactation curves. A
multiple-trait, derivative-free, restricted maximum
likelihood (MTDFREML) procedure,
utilizing ...

Direct and correlated responses to selection
for improved feed conversion were estimated
from performance records of 1459 Polled
Hereford cattle born from the spring of 1967
through the spring of 1979. Data were ...